Publications by Type: Conference Proceedings

2017
E. D. Maalouf and Torres-Verdín, C., “Interpretation of sonic measurements acquired in high-angle and horizontal wells using 3D fast forward modeling (Expanded Abstract),” Society of Petrophysicists and Well Log Analysts (SPWLA) 58th Ann. Logging Symposium. Oklahoma City, OK, June 17-21, 2017.
A. Mehmani, Kelly, S., Torres-Verdín, C., and Balhoff, M., “Quantification of fracture-matrix fluid transport in unconventional rocks using two-scale microfluidic chips (Expanded Abstract),” Unconventional Resources Technology Conference (URTeC). Austin, Texas, July 24 – 26, 2017.
A. Menshov, Brick, Y., Torres-Verdín, C., and Yilmaz, A. E., “Recent progress in rigorous algorithms for the fast solution of 3-D EM frequency-domain integral equations (Expanded Abstract),” Sixth International Symposium on Three-Dimensional Electromagnetics. Berkeley, CA, March 28-30, 2017.
M. Luycx and Torres-Verdín, C., “Resolution and accuracy of neutron-gamma density measurements compared to conventional gamma-gamma density measurements (Expanded Abstract),” Society of Petroleum Engineers (SPE) 2017 Annual Technical Conference and Exhibition. San Antonio, TX, October 9-11, 2017.
D.Pylorof and Bakolas, E., “Robust Control of Input Constrained Nonlinear Systems Subject to
Unknown Bounded Disturbances Based on Convex Optimization
,” American Control Conference. Seattle, WA, 2017.
M. J. Ramos, Espinoza, D. N., Torres-Verdín, C., Spikes, K. T., and Laubach, S. E., “Stress-dependent dynamic-static transforms of anisotropic Mancos shale (Extended Abstract),” American Rock Mechanics Association (ARMA) 51st US Rock Mechanics/Geomechanics Symposium. San Francisco, California, June 25-28, 2017.
C. E. Tinney, “Wall pressure unsteadiness on the aft deck of a planar multi-stream supersonic nozzle,” 55th AIAA Aerospace Sciences Meeting, AIAA Paper 2017-0525. Grapevine, Texas, USA, 2017.Abstract
The unsteady wall pressure on the aft deck of a multi-stream, planar supersonic nozzle is studied over a range of nozzle operating conditions corresponding to independent changes to the core and bypass stream pressure ratios. The data are processed using time-frequency analysis and reveal various tones corresponding to transonic resonance as wellunsteady interactions of both separation and reflection shocks with the developing boundary layer. The position of the separation shock is shown to experience significant hysteresis effects, which subside at pressure ratios well above the design pressure ratio of the nozzle. Shadowgraphy images of the exhaust plume are also presented, which are then analyzed using the snapshot form of proper orthogonal decomposition. The findings from this low-dimensional analysis demonstrates how the first most energetic mode highlights the shock cell patterns whereas the second most energetic mode elucidates turbulence motions in the plume.
2016
V. Puzyrev and Torres-Verdín, C., “3D simulations of deep directional electromagnetic tools in high-angle and horizontal wells (Expanded Abstract).,” European Association of Geoscientists and Engineers (EAGE) 78th Ann. Conference and Exhibition. Vienna, Austria, May 30-June 2., 2016.
V. Puzyrev and Torres-Verdín, C., “3D simulations of deep directional electromagnetic tools in high-angle and horizontal wells (Expanded Abstract),” European Association of Geoscientists and Engineers (EAGE) 78th Ann. Conference and Exhibition. Vienna, Austria, May 30-June 2, 2016.
R. Xu*, Mehmani, A., Qajar, A., Prodanović, M., Daigle, H., and Nguyen, S., “Combination of Lattice Density Functional Theory and a Multi-Scale Network Model for Sorption Isotherms Study in Tight Formations,” Unconventional Resources Technology Conference, San Antonio, Texas, 1-3 August 2016. Society of Exploration Geophysicists, American Association of Petroleum Geologists, Society of Petroleum Engineers, pp. 2255-2266, 2016.
B. B. Hoxha, Sullivan, G., van Oort, E., Daigle, H., and Schindler, C., “Determining the zeta potential of intact shales via electrophoresis,” SPE Europec featured at 78th EAGE Conference and Exhibition. Society of Petroleum Engineers, 2016.
B. Zhang* and Daigle, H., “Direct Determination of Surface Relaxivity in Isolated Kerogen by Pulsed-Field Gradient NMR,” Unconventional Resources Technology Conference, San Antonio, Texas, 1-3 August 2016. Society of Exploration Geophysicists, American Association of Petroleum Geologists, Society of Petroleum Engineers, pp. 2149-2158, 2016.
R. Rojo, Tinney, C. E., and Ruf, J. H., “Effect of stagger on the vibroacoustic loads from clustered rockets,” 54th AIAA Aerospace Sciences Meeting, AIAA Paper 2016-1016. San Diego, California, USA, 2016.Abstract
The effect of stagger startup on the vibro-acoustic loads that form during the end-effects regime of clustered rockets is studied using both full-scale (hot-gas) and laboratory scale (cold gas) data with vehicle geometry. Both configurations comprise three nozzles with thrust optimized parabolic contours that undergo free shock separated flow and restricted shock separated flow as well as an end-effects regime prior to flowing full. Acoustic pressure waveforms recorded at the base of the nozzle cluster are analyzed using various statistical metrics as well as time-frequency analysis. The findings reveal a significant reduction in end-effects regime loads when engine ignition is staggered. However, regardless of stagger, both the skewness and kurtosis of the acoustic pressure time derivative elevate to the same levels during the end-effects regime thereby demonstrating the intermittence and impulsiveness of the acoustic waveforms that form during engine startup.
K. Yang, Yilmaz, A., and Torres-Verdín, C., “Efficient 3D parametric inversion of hydraulic fractures with low-frequency borehole tri-axial electromagnetic measurements (Expanded Abstract).,” Society of Exploration Geophysicists (SEG) 86th Ann. Internat. Mtg. Dallas, TX, October 16-21., 2016.
K. Yang, Yilmaz, A., and Torres-Verdín, C., “Efficient 3D parametric inversion of hydraulic fractures with low-frequency borehole tri-axial electromagnetic measurements (Expanded Abstract),” Society of Exploration Geophysicists (SEG) 86th Ann. Internat. Mtg. Dallas, TX, October 16-21, 2016.
J. D. Escobar, Torres-Verdín, C., Proett, M., and Ma, S. M., “Evaluating the impact of multiphase flow properties on formation-tester pressure transients (Expanded Abstract).,” Society of Petroleum Engineers (SPE) 2016 Annual Technical Conference and Exhibition. Dubai, UAE, September 26-28., 2016.
J. D. Escobar, Torres-Verdín, C., Proett, M., and Ma, S. M., “Evaluating the impact of multiphase flow properties on formation-tester pressure transients (Expanded Abstract),” Society of Petroleum Engineers (SPE) 2016 Annual Technical Conference and Exhibition. Dubai, UAE, September 26-28, 2016.
M. Lotfollahi, Kim, I., Beygi, M. R., Worthen, A. J., Huh, C., Johnston, K. P., Wheeler, M. F., and DiCarlo, D. A., “Experimental Studies and Modeling of Foam Hysteresis in Porous Media,” SPE Improved Oil Recovery Conference. Society of Petroleum Engineers, 2016. Publisher's VersionAbstract
The use of foam in gas enhanced oil recovery (EOR) processes has the potential to improve oil recovery by reducing gas mobility. Nanoparticles are a promising alternative to surfactants in creating foam in the harsh environments found in many oil fields. We conducted several CO2-in-brine foam generation experiments in Boise sandstones with surface-treated silica nanoparticle in high-salinity conditions. All the experiments were conducted at the fixed CO2 volume fraction (g = 0.75) and fixed flow rate which changed in steps. We started at low flow rates, increased to a medium flow rates followed by decreasing and then increasing into high flow rates. The steady-state foam apparent viscosity was measured as a function of injection velocity. The foam flowing through the cores showed higher foam generation and consequently higher apparent viscosity as the flow rate increased from low to medium and high velocities. At very high velocities, once foam bubbles were finely textured, the foam apparent viscosity was governed by foam shear-thinning rheology rather than foam creation. A noticeable "hysteresis" occurred when the flow velocity was initially increased and then decreased, implying multiple (coarse and strong) foam states at the same superficial velocity. A normalized generation function was combined with CMG-STARS foam model to cover the full spectrum of foam flow behavior observed during the experiments. The new foam model successfully captures foam generation and hysteresis trends observed in presented experiments in this study and other foam generation experiments at different operational conditions (e.g. fixed pressure drop at fixed foam quality, and fixed pressure drop at fixed water velocity) from the literature. The results indicate once foam is generated in porous media, it is possible to maintain strong foam at low injection rates. This makes foam more feasible in field applications where foam generation is limited by high injection rates (or high pressure gradient) that may only exist near the injection well. Therefore, understanding of foam generation, and foam hysteresis in porous media and accurate modeling of the process are necessary steps for efficient foam design in field.
P. Zhang, Shiriyev, J., Torres-Verdín, C., Sharma, M. M., Brick, Y., Massey, J., and Yilmaz, A., “Fracture diagnostics using a low-frequency electromagnetic induction method (Extended Abstract).,” American Rock Mechanics Association (ARMA) 50th US Rock Mechanics/Geomechanics Symposium. Houston, Texas, June 26-29, 2016.
P. Zhang, Shiriyev, J., Torres-Verdín, C., Sharma, M. M., Brick, Y., Massey, J., and Yilmaz, A., “Fracture diagnostics using a low-frequency electromagnetic induction method (Extended Abstract),” American Rock Mechanics Association (ARMA) 50th US Rock Mechanics/Geomechanics Symposium. Houston, Texas, June 26-29, 2016.

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